Weak European, Brazil Markets Take Shine Off Auto Maker's Performance in U.S.

The newly combined Fiat SpA and Chrysler Group LLC rolled out a new name, a new logo and plans for a new corporate structure, but fourth-quarter results and a glum outlook for 2014 showed the challenges ahead for the world's seventh largest auto maker.

Now known as Fiat Chrysler Automobiles NV, the company reported higher fourth-quarter net profit largely because of a Chrysler tax benefit. Its operations showed growing strains as losses in Europe and an earnings decline in South America offset gains from higher truck and...